EP1721704A1 - Dispositif et procédé permettant de dresser une meule, ainsi qu'une machine de meulage pour ce procédé - Google Patents

Dispositif et procédé permettant de dresser une meule, ainsi qu'une machine de meulage pour ce procédé Download PDF

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Publication number
EP1721704A1
EP1721704A1 EP06113861A EP06113861A EP1721704A1 EP 1721704 A1 EP1721704 A1 EP 1721704A1 EP 06113861 A EP06113861 A EP 06113861A EP 06113861 A EP06113861 A EP 06113861A EP 1721704 A1 EP1721704 A1 EP 1721704A1
Authority
EP
European Patent Office
Prior art keywords
dressing
grinding wheel
tool
rotation axis
predetermined rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06113861A
Other languages
German (de)
English (en)
Inventor
Maurizio Frari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FMT FUTURE MANUFACTURING TECHNOLOGY S.R.L.
Original Assignee
Meccanodora SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meccanodora SpA filed Critical Meccanodora SpA
Publication of EP1721704A1 publication Critical patent/EP1721704A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/04—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels
    • B24B53/053—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels using a rotary dressing tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/12—Dressing tools; Holders therefor

Definitions

  • the present invention relates to a tool, a method and a device for dressing grinding wheels.
  • CBN cubic boron nitride
  • the dressing disc UR is caused to translate along its rotation axis AR.
  • the dressing machine must be provided with suitable devices for implementing such translational movement.
  • An object of the present invention is enabling a simplified construction, in comparison with known dressing machines, of dressing machines for grinding wheels, in particular but not necessarily grinding wheels wherein cubic boron nitride or abrasives are used, having comparable or greater hardness.
  • this object is achieved with a dressing method having the features according to claim 8.
  • this object is achieved with a dressing machine having the features according to claim 13.
  • a drum dressing tool provided with a suitable dressing abrasive material -such as natural or synthetic, monocrystalline or polycrystalline (in English PCD) diamond arranged on the side surface of the tool itself so as to provide at least a helix portion that winds round the predetermined rotation axis of the tool, allows the whole side surface of a grinding wheel to be dressed with no need of translating the dressing tool along the rotation axis of the tool itself or of the grinding wheel, or of translating the grinding wheel relative to the tool. This allows providing simpler dressing devices - for example as regards as the mechanical, electrical or control construction.
  • a suitable dressing abrasive material such as natural or synthetic, monocrystalline or polycrystalline (in English PCD) diamond arranged on the side surface of the tool itself so as to provide at least a helix portion that winds round the predetermined rotation axis of the tool
  • Figures 1,2 refer to a first embodiment of a dressing tool according to the present invention; such tool UR' is substantially shaped like a drum defining a cylindrical side surface LU, and is suitable for rotating around the symmetry axis AR of the cylinder - in the present description also referred to as "predetermined rotation axis AR" of the dressing tool.
  • a radially protruding projection 1 is provided - having, in the present embodiment, the shape of a continuous ribbing that forms an helix portion 2 which winds round the rotation axis AR; moreover dressing abrasive material (in the Figures depicted with thicker darker lines or zones), suitable for dressing a grinding wheel M, is provided on the top part of the radially protruding projection 1.
  • the grinding wheel M rotates around one of its rotation axes AM.
  • the abrasive material of the grinding wheel M is based on cubic boron nitride (CBN)
  • the dressing abrasive material is a material suitable for dressing the grinding wheel M, such as an industrial polycrystalline grain diamond
  • the helix 2 formed by the projection 1 extends at least over a suitable portion - indicatively at least from 80% up to 100% - of the whole height HM ( Figure 2) of the side surface LM of the grinding wheel M, or - preferably - beyond the whole height HM of the side surface LM of the grinding wheel M (that is, like in the situation of Figure 2: the height HU by which the helix 2 extends over the side surface LU of the dressing tool UR' is greater then the height HM of the side surface LM of the grinding wheel M).
  • CBN cubic boron nitride
  • the dressing abrasive material is a material suitable for dressing the grinding wheel M, such as an industrial polycrystalline grain diamond
  • the helix 2 formed by the projection 1 extends at
  • the whole side surface LM of the grinding wheel M can be dressed by simply rotating the dressing tool UR' around the axis AR with no need of translating the tool UR' along the axis AR or along the rotation axis AM of the grinding wheel, or further with no need of translating the grinding wheel relative to the dressing tool.
  • the projection 1 forms a helix 2 that in its turn forms a single turn substantially extending over the whole side surface LU of the dressing tool UR', that is the helix 2 has a pitch substantially not smaller than the height HM of the side surface LM of the grinding wheel to be dressed. This way, during the dressing there is only one single contact zone between the dressing abrasive material provided on the helix 2 and grinding wheel M.
  • FIG. 9 shows the case of a grinding wheel M' having a slightly hourglass-shaped side surface LM', dressed with a tool UR V having a substantially cylindrical side surface LU V .
  • the rotation of the tool UR V around its rotation axis AR V can be coordinated with a displacement -at least a translation one- in a direction perpendicular, or however transverse, to the axis AR V itself -see arrow F of Figure 9-, so that the contact zone between the crest of the helix 2 and the grinding wheel M' matches the shape of the side surface LM' of the latter.
  • the dressing device or dressing machine that carries this way of dressing out will be provided with suitable means for coordinating or synchronising the rotation of the dressing tool AR V with its translation in a direction normal to its rotation axis AR, as well as with suitable driving devices for allowing the dressing tool UR V to translate in a direction normal to its rotation axis AR.
  • the rotation of the tool UR V can be coordinated with a displacement of its rotation axis in a direction parallel - or however not longitudinal to- the rotation axis AM of the grinding wheel to be dressed.
  • the dressing tool helix can form also several turns, and have a smaller pitch even than the height HM of the side surface LM of the grinding wheel to be dressed, so as to have two or more simultaneous contact zones, during the dressing, between the helix 2 and the grinding wheel M.
  • Figure 3 schematically shows a detail of the cross-section of the radially protruding projection 1, according to a cross-section meridian plan containing the rotation axis AR of the tool UR': the top part of the projection 1 defines a contact side 10, having such shape that its cross-sections are substantially not flat - in the example of Figure 3, the cross-sections of the contact side 10 are convex;
  • Figure 6 shows an example of a contact side 10 having flat cross-section. This way the dressing tool UR' is prevented from "polishing" the side surface LM of the grinding wheel M.
  • the phenomenon of the polishing is more marked that in other kinds of grinding wheels and therefore, in order to avoid or however to reduce such phenomenon, is prefearable that the cross-sections of the contact side 10 -in particular the projecting parts thereof- have radiuses of curvature not greater than 0,4 millimeter.
  • the cross-sections of the contact side 10 - in particular the projecting parts thereof- have radiuses of curvature not greater than 0,2-0,3 millimeter.
  • the choosen radius of curvature R is about 0,15 millimeter.
  • the present invention further relates to a method for dressing a grinding wheel M with a tool UR' as previously described.
  • Such dressing method comprises the following steps:
  • the dressing tool UR' is not translated along its rotation axis AR or, more generally, is not translated with a substantially non-null displacement component longitudinally to its rotation axis AR.
  • the dressing tool UR' is not translated in a direction parallel to the rotation axis AM of the grinding wheel or, more generally, is not translated with a substantially non-null displacement component longitudinally to the rotation axis AM of the grinding wheel M.
  • the positions of the rotation axis AR of tool UR', and of the rotation axis AM of the grinding wheel M to be dressed are kept in positions fixed one relative to another, and neither the grinding wheel nor the dressing tool UR' can slide with substantially not null displacement components longitudinally to the respective axes AM, AR.
  • the dressing can be carried out either without displacing the axes AM and/or AR in directions normal to themselves, or by displacing at least one of the two axes in a direction normal to itself - in this second case the dressing is called "plunge dressing".
  • a third aspect of the present invention relates to a dressing device or to a dressing machine suitable for carrying out the dressing methods previously described, wherein the wording "dressing device” is referred to a device substantially comprised in a machining station for a different working -such as a grinding machine, while the wording "dressing machine” indicates roughly and substantially a stand-alone machine or working station substantially.
  • such dressing device or dressing machine lacks means suitable for translating the dressing tool with a substantially non-null displacement component longitudinally to its own predetermined rotation axis AR relative to the grinding wheel, during the dressing: as an example the drum of the tool UR' can be fixed on a shaft or on another suitable support -not shown- so as to block its sliding along or relative its rotation axis AR, during the dressing operation only or permanently.
  • a dressing device or dressing machine can lack means for translating the dressing tool with a substantially non-null displacement component longitudinally to the predetermined rotation axis AM of the grinding wheel during the dressing: as an example the drum of the tool UR' can be fixed on a shaft or on another suitable support - not shown- so as to block its sliding along or relative to the rotation axis AM of the grinding wheel M, during the dressing operation only or permanently.
  • the dressing tool UR' can comprise a drum in its turn provided with a side surface LU having not only cylindrical shape, but more generally having axial or radial symmetry relative to a predetermined rotation axis AR.
  • That side surface LU can have longitudinal cross-sections, according to meridian section-planes, having also a convex profile (such as in Figure 7, which shows a substantially barrel-shaped drum dressing tool UR III ), a concave profile (such as in Figure 8, which shows a substantially hourglass-shaped drum dressing tool UR IV ) or a concave-convex profile.
  • the dressing tool can comprise a substantially frustum-conical drum.
  • the grinding wheel M to be dressed can have not only a substantially cylindrical shape, but also define more generally a side surface LM having axial or radial symmetry relative to a predetermined rotation axis AM of the grinding wheel M itself.
  • the dressing abrasive material can be a deposit - or an insert- of not only monocrystalline-but also polycrystalline industrial diamond, and can be arranged on the side surface LU of the tool so as to form one or several helix portions that winds round/that wind round a predetermined rotation axis AR, respectively.
  • That helix can have a constant or variable pitch, and to be single- or multi-threaded, and/or can be provided not only with a continuous ribbing 1 that winds round axis AR but also a sequence of several radially protruding projections - for example ribbings or bosses- separated one from another.
  • the wordings relating to the translations of the dressing tool relative to a grinding wheel to be dressed are to be understood as relating to a movement of the grinding wheel and the tool relative one to another, and comprising the case of a tool that translates relative to a grinding wheel, wherein that grinding wheel does not translate relative to the frame of the dressing station, as well as the case of a tool fixed relative to a grinding wheel that translates relative to the frame of the dressing station.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP06113861A 2005-05-13 2006-05-12 Dispositif et procédé permettant de dresser une meule, ainsi qu'une machine de meulage pour ce procédé Withdrawn EP1721704A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20050329 ITTO20050329A1 (it) 2005-05-13 2005-05-13 Utensile ravvivatore, metodo per la ravvivatura di mole abrasive, e macchina per realizzare tale metodo.

Publications (1)

Publication Number Publication Date
EP1721704A1 true EP1721704A1 (fr) 2006-11-15

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ID=36917334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06113861A Withdrawn EP1721704A1 (fr) 2005-05-13 2006-05-12 Dispositif et procédé permettant de dresser une meule, ainsi qu'une machine de meulage pour ce procédé

Country Status (2)

Country Link
EP (1) EP1721704A1 (fr)
IT (1) ITTO20050329A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012019131A3 (fr) * 2010-08-06 2012-07-12 Saint-Gobain Abrasives, Inc. Outil abrasif et procédé pour finir des formes complexes dans pièces à travailler
EP2327511A3 (fr) * 2009-11-25 2013-05-29 Hochschule Furtwangen Outil de dressage et de profilage d'une meule

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1196564A (en) * 1968-07-25 1970-07-01 Fritz Bocker A method of and dressing tool for forming and dressing helically ribbed grinding wheels
DE3419632A1 (de) * 1983-05-26 1984-11-29 Lach Spezialwerkzeuge GmbH, 6450 Hanau Profilabrichtwerkzeug
US4683679A (en) * 1986-01-06 1987-08-04 Salmon Stuart C Grinding and dressing wheel support and release apparatus
US4915089A (en) * 1988-01-28 1990-04-10 General Electric Company Tool for trueing and dressing a grinding wheel and method of use

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1196564A (en) * 1968-07-25 1970-07-01 Fritz Bocker A method of and dressing tool for forming and dressing helically ribbed grinding wheels
DE3419632A1 (de) * 1983-05-26 1984-11-29 Lach Spezialwerkzeuge GmbH, 6450 Hanau Profilabrichtwerkzeug
US4683679A (en) * 1986-01-06 1987-08-04 Salmon Stuart C Grinding and dressing wheel support and release apparatus
US4915089A (en) * 1988-01-28 1990-04-10 General Electric Company Tool for trueing and dressing a grinding wheel and method of use

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2327511A3 (fr) * 2009-11-25 2013-05-29 Hochschule Furtwangen Outil de dressage et de profilage d'une meule
WO2012019131A3 (fr) * 2010-08-06 2012-07-12 Saint-Gobain Abrasives, Inc. Outil abrasif et procédé pour finir des formes complexes dans pièces à travailler
US8911283B2 (en) 2010-08-06 2014-12-16 Saint-Gobain Abrasives, Inc. Abrasive tool and a method for finishing complex shapes in workpieces

Also Published As

Publication number Publication date
ITTO20050329A1 (it) 2006-11-14

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